Grating attachment



June 1, 1943. w. c. HEATH GRATING ATTACHMENT Filed March 27, 1941William Cj/eafh INVENTOR. BY W Z ATTORNEY.

Patented June 1, 1943 UNITED STATES PATENT OFFICE GRATING ATTACHMENT 7William 0. Heath, Shorewood, Wis., assignor to A. 0. Smith Corporation,Milwaukee, Wis., a corporation of New York Application March 27, 1941,Serial No. 385,480

4 Claims.

This invention relates to grating attachment, and more particularly tothe holding structure for securing sections of. grating to a foundationor support to provide a safety tread.

The object of the invention is to provide a holding lug integral withthe grating bars and suitable for bolting to a foundation.

While various types of lugs might be provided for a grating, the presentinvention provides a structure which has advantages in that the ing isonly lightly welded to the grating, and the weld is not relied uponeither as a support or as a hold down for the grating.

The invention has been applied in the construction of grating of thegeneral character set forth in co-pending application, Serial No.385,478 filed on even date herewith by the present inventor.

This embodiment of the invention is illustrated in the accompanyingdrawing in which:

Figure 1 is a perspective view of a section of grating with parts brokenaway;

Fig. 2 is a perspective view of the lug prior to its being welded inplace; and

Fig. 3 is a detail section showing the attachment of the grating to asupport.

The grating comprises a series of spaced parallel longitudinal bars Iand a series of spaced parallel transverse bars 2. The bars are of stripmetal set on edge, and bars 2 rest in slots in the bars I to present acommon safety tread therewith. The upper edges of the bars I and 2 areserrated for safety purposes. The bars 2 are lightly welded to the barsI at the bottom of the slots as set forth in applicant's co-pendingapplication above referred to.

The lug of the present invention is blanked and formed from a sheet ofmetal. As illustrated in Fig. 2. it comprises a horizontal web 3 havinga central, preferably square, opening 4 for receiving a bolt 5. The web3 is about square and its width may be equal to or somewhat less thanthe distance between two adjacent longitudinal bars I.

At each end, the web 3 has an upwardly bent flange 8 of about half theheight of the bars I, and longer than the width of the web 3. The topedge of each flange 6 may be serrated similar to the serrations of thelongitudinal bars so that the flange may provide a part of the treadsurface. Where the flange 8 is not serrated its upper edge should bebelow the level of the tread surface so as not to interfere with thelatter.

The bars I to which the 1118 is to be attached have downwardly extendingslots I in the top edges thereof to receive the flanges 8.

The ends of flanges I have their lower edges cut flat to rest directlyupon the upper edges of bars I at the bottoms of slots I for the purposeof being welded thereto. The welding of flanges G to the respective barsI is similar to that of the bars 2 to'the bars I, and is.preferablyaccomplished by applying a relatively light resistance welding currentand light pressure.

As shown in Fig. 3 the grating is held down on a supporting bar 8 bymeans of the bolt 5 passing through the opening 4 in web 3 and anopening in bar 8. The nut 9 secures the bolt tight.

The lug has the advantage of not interfering with and preferablyproviding a part of the safety tread surface, and of clamping the.grating down by vertically downward pressure on adjacent bars withoutany tendency to twist or turn the bars out of their vertical position. v

Various embodiments of the invention may be employed within the scope ofthe claims.

The invention is claimed as follows:

1. In a grating, a plurality of spaced parallel bars having uppersurfaces presenting a common safety tread, and a clamping lug extendingbetween two adjacent bars and having a horizontal web and verticalupstanding flanges of greater length than the width of the web, saidflanges being set on edge in vertical slots in said bars and weldedthereto.

2. In a grating, a plurality of spaced parallel bars having upperserrated surfaces presenting a common safety tread, and a clamping lugextending between two adjacent bars and having upstanding flanges set onedge in vertical slots in said bars and welded thereto, the upper edgesof said flanges being serrated and lying in the plane of the serratedtread surface to provide a part of said tread.

3. In a grating, a plurality of spaced parallel bars having uppersurfaces presenting a common safety tread, and a clamping lug extendingbe tween two adjacent bars and having a horizontal web and upstandingflanges of greater length than the width of the web, said flanges beingset on edge in vertical slots in said bars to provide a part of saidsafety tread, said flanges being of less depth than said bars and weldedat their lower edges to said bars.

4. In a grating, a plurality of spaced parallel bars having uppersurfaces presenting a common safety tread, and a clamping lug extendingbetween two adiacent bars and having vertically disposed flanges restingon edge in substantially deep vertical slots in said bars to applyvertically downward pressure directly to said bars without interruptingor interfering with the safety tread and without twisting said bars outof upright position.

WILLIAM C. HEATH.

